Writing instrument



FIG. 1 is a left side elevational view showing our new design, the right side elevational view being a mirror image thereof;

FIG. 2 is a rear view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a perspective view taken from the front, side and above thereof;

FIG. 5 is a perspective view taken from the front, side and below thereof;

FIG. 6 is a plan view; and,

FIG. 7 is a bottom view. 

The ornamental design for a writing instrument, as shown and described. 